–Do you know where I can cut off the water? (correct)
This construction can be troublesome for learners of English, because there is a tendency to make the dependent clause (where I can cut off...) a question as well:
–Do you know where can I cut off the water? (incorrect)
Both do you know and where can I cut off the water are legitimate questions when used separately. However, when combined in a single sentence the main clause (Do you know...) carries the full weight of the interrogative.
Here are some additional examples:
–Do you see it? Where is it?
–>Do you see where it is?
–Do you know when? When does he arrive?
–>Do you know when he arrives?
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